Foil drop generator for foliar chemigation: Field evaluation

W. A. Marouelli, P. M. Waller

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Chemigation field experiments were conducted with a new drop generator for oil-based foliar chemicals. The drop generator was adjusted to generate two drop-size distributions with d(max) of 980 μm and 98 μm. Soybean oil concentration in sprinkler sprays was measured along the 379-m-long center pivot irrigation pipeline; uniformity coefficients along the center pivot pipeline were 73% and 98%, respectively. An experiment with a conventional straight tube injector was also conducted, and calculated d(max) was 1850 μm; oil discharge uniformity coefficient along the pipeline was 61%. The calculated drop-size distributions for the three experiments were input into a dispersed phase pipeline transport model; the model calculates oil discharge concentration versus distance along the pipeline. The root mean square deviation error between experimental and simulated concentration curves were 40%, 28%, and 3% for the straight tube, 980 μm, and 98 μm experiments, respectively. The models were used to develop graphs for discharge concentration uniformity as a function of d(max) and relative density of oil and water in the pipeline. The model simulations and experiments showed that the drop generator and two-phase transport model provide the ability to control oil discharge concentration uniformity along a center pivot pipeline.

Original languageEnglish (US)
Pages (from-to)1599-1607
Number of pages9
JournalTransactions of the American Society of Agricultural Engineers
Issue number6
StatePublished - Nov 1999


  • Center pivots
  • Chemigation
  • Droplet size distribution
  • Foliar washoff
  • Irrigation
  • Transport simulation
  • Two phase flow

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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